Meadhbh Hamrick (Infinity) wrote:
part of the problem with selecting a sequence number and seeding a PRNG with it is that it is relatively easy to guess the sequence number. there have in fact been a series of attacks based on this, including the recent DNS problems. and even if we could, there would still be the problem that applying a key stream to a packet. PRNGs are generally not intended to be used this way and are not designed to resist attacks based on key-stream recovery.
There is a PRNG in use that was designed for cryptography. It's implemented in the algorithm RC4
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